HART® Protocol User Manual
30121-84 Rev. 1.0
December, 2014
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TABLE OF CONTENTS
Summary
Electrical connection of HART module _____________________________ 3
LED indication _______________________________________________ 3
General Description ___________________________________________ 4
Wiring _____________________________________________________ 4
Device Description file _________________________________________ 5
HART Universal commands description ____________________________ 6
HART Common Practice commands description _____________________ 15
HART Device specific commands description _______________________ 16
NOTES ____________________________________________________ 17
ADDRESSES ________________________________________________ 18
HART® is a registered trademark of the HART Communiation Foundation.
Copyright © 20014 McCrometer, Inc. All printed material should not be changed or altered without permission of McCrometer. Any
published technical data and instructions are subject to change without notice. Contact your McCrometer representative for current
technical data and instructions.
2
3255 WEST STETSON AVENUE • HEMET, CALIFORNIA 92545 USA
TEL: 951-652-6811 • 800-220-2279 • FAX: 951-652-3078 Printed In The U.S.A.
www.mccrometer.com Lit. 30121-84 Rev. 1.0/12-14
3
Electrical connection of HART module
HART MODULE
LOOP POWER SUPPLY
LED
-
24VDC
-
+
+
250 - 800 Ohm
HART
INTERFACE
Terminals designations and cable connection
LED indication
The HART communication module has a LED that can display the following status:
At start when power supply goes on, the LED remain fixed on.
After five second, if the module is OK the LED blinking three times.
At this point the LED flash on-off only during its transmission.
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3
General Description
HART (acronmimous of Highway Addressable Remote Transducer) was developed by Rosemount
in the mid-1980s, as microprocessor-based digital 'smart' instruments were first appearing.
HART allowed digital data to be superimposed on to conventional 4-20mA cable loops without
disturbing analogue signals since its average is zero.
HART is a master-slave protocol which means that a field device only replies when it is spoken to.
It is used to communicate digitally with the outside world for remote configuration, diagnostics
and management purposes.
HART can provide many 'fieldbus-like' functions and it retains full backwards-compatibility with
existing control strategies.When this option is installed it is possible to read the process data from
the Flow meter.
The HART protocol uses the Bell 202 standard frequency shift keying (FSK) signal to
communicate at 1200 baud.
The module supports HART commands including Universal, Common Practice and
Device Specific Command.
The Hart protocol implemented in the module is conforms to Hart revision 7.0.
The HART module mounted in the Electromagnetic Flow Meter is used for to connect the
converter to the HART fieldbus network.
The HART slave can be addressed by two Masters for example a permanent master and a
temporary Master like a hand held communicator.
When the HART fieldbus is in digital mode configuration (multi-drop) there can be two masters
(e.g.a control system and a hand-held communicator) and up to 15 devices connected to the
same bus.
The HART module mounted in the Electromagnetic Flow Meter does not implement the HART
Burst mode.
Wiring
Signal wiring not need be shielded, but twisted pair should be used for best results.In order to
ensure reliable communication, the wiring should be 24 AWG or larger and should not exceed 1
mile in length.
NOTE : Do not run signal wiring in conduit or open trays with power wiring, or near
heavy electrical equipment or motors or generators.
Signal wiring may be grounded at any one point in the signal loop, or it may be left ungrounded.
The negative terminal of the power supply is a recommended grounding point.
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Device Description File
To communicate with the converter with the HART module a Device Description File (DD file)
compatible with the Smart Device Communicator SDC 625 relased by the Hart Communication
Foundation is required. You can download the DD file at http://www.mccrometer.com/support/hart.
Device Description file
asp .
The Converter with HART module is supplied with the DD file compatible with the Smart Device
In the following pictures
Communicator SDC 625there are the
released aspects
by HCF of Comunication
(Hart the data presented by the DD file in the SDC 625
Foundation).
communicator.
In the following pictures there are the aspects of the data presented by the DD file in the SDC
625 comunicator.
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HART Universal commands description
The following section contain the description of the HART Universal commands implemented in
the module.
COMMAND 00
Read Unique Identifier
Description:
This command gets the long address of the HART device plus other manufacturer information like
Manufacturer Id, Device Type Code, Software Revision, Hardware Revision, etc.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
Constant “254” “254” UNSIGN (1 BYTE)
EXPANDED DEVICE TYPE EXPAND DEV TYPE ENUM (2 Byte)
MINIMUM PREAMBLES - MIN # PREAMBLES UNSIGN (1 BYTE)
REQUEST
HART PROTOCOL MAJOR REV HART PROTOCOL REV UNSIGN (1 BYTE)
DEVICE REVISION LEVEL DEV. REV LEVEL UNSIGN (1 BYTE)
DEVICE SOFTWARE REVISION SOFTWARE REV. LEVEL UNSIGN (1 BYTE)
LEVEL
ELECTRONICS REVISION LEVEL ELECTRONICS REV. LEVEL UNSIGN (1 BYTE)
(HARDWARE)
PHYSICAL SIGNALING CODE STACK SOFT. REV ENUM (1 Byte)
FLAGS FLAGS ENUM (1 Byte)
DEVICE ID DEV. ID NUMB. UNSIGN (3 BYTE)
MINIMUM PREAMBLES - UNSIGN (1 BYTE)
RESPONSE
MAXIMUM # OF VARIBLES MAX # VARIABLES UNSIGN (1 BYTE)
CONFIGURATION CHANGE CONFIG CHANGE COUNT UNSIGN (2 BYTE)
COUNTER
EXTENDED FIELD DEVICE UNSIGN (1 BYTE)
STATUS
MANUFACTURER ID CODE ENUM (2 Byte)
PRIVATE LABEL DIST. CODE ENUM (2 Byte)
DEVICE PROFILE CODE ENUM (2 Byte)
76
COMMAND 01
Read Primary Variable
Description:
This command gets the device Primary Variable that correspond to the flow rate.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
READ PV VARIABLE (FLOW PV UNITS CODE CHAR (1 BYTE)
UNITS, & FLOW VALUE) PV VALUE FLOAT (4 BYTE)
NOTE: The measure unit is the same of the display of the converter.
COMMAND 02
Read Current And Percent Of Range
Description:
This command gets the current of the loop that is forced by the HART device and
the Percent of Range of the Current.
The value of the current loop is linked to the flow rate.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
READ PV CURRENT AND % PV I VALUE (mA) FLOAT (4 BYTE)
RANGE
% PV VALUE FLOAT (4 BYTE)
COMMAND 03
Read Dynamic Variables
Description:
This command gets the current and four (predefined) dynamic variables.
The PV correspond to the flow rate of the converter.
The SV correspond to the totalizer positive of the converter.
The TV correspond to the totalizer negative of the converter.
The FV is not used.
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Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
READ PV CURRENT OUT & PV I VALUE (mA) FLOAT (4 BYTE)
ALL DYNAMIC VARIABLE PV UNITS CODE CHAR (1 BYTE)
PV VALUE FLOAT (4 BYTE)
SV VALUE FLOAT (4 BYTE)
TV VALUE FLOAT (4 BYTE)
FV VALUE (not used) FLOAT (4 BYTE)
NOTE: The measure unit is the same of the display of the converter.
COMMAND 06
Write Polling Address
Description:
This command writes the polling address of the HART device.
Extreme care should be taken when you use this command because you can loose the
comunication with the device.
The polling address can be readed and changed with the menu Comunication Address of the
Converter.
See the menu Comunication in the Converter.
When modify the polling address with the HART command 06, the menu Address in the menu
Comunication of the Converter is updated.
Write Parameters:
Description HART Data Type Data size
WRITE NODE ID (WRITE POLLING ADDRS CHAR (1 BYTES)
POLLING ADDRESS) LOOP CUR MODE CHAR (1 BYTES)
Data Returned:
Description HART Data Type Data size
POLLING ADDRESS POLLING ADDRS CHAR (1 BYTES)
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8
COMMAND 07
Read loop configuration
Description:
This command gets loop current mode status.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
READ LOOP POLLING ADDRS CHAR (1 BYTES)
CONFIGURATION LOOP CUR MODE CHAR (1 BYTES)
COMMAND 08
Read Dynamic Variables classification
Description:
This command gets the classification of the four (predefined) dynamic variables.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
READ DYNAMIC VARIABLE ENUM (4 BYTES)
CLASSIFICATIONS
COMMAND 09
Read Device variable with status
Description:
This command read the device variables with status.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
EXTENDED FIELD DEVICE BITMAP BITS (1 BYTE)
STATUS
SLOT X DEV. VARIABLE UNSIGNED (1 BYTE)
CODE
10
9
SLOT X DEV. VARIABLE ENUM (1 BYTE)
CLASS
SLOT X UNITS COD ENUM (1 BYTE)
SLOT X DEV. VARIABLE FLOAT (4 BYTE)
VALUE
SLOT X DEV. VARIABLE BITS (1 BYTE)
STATUS
SLOT X DATA TIME STAMP UNSIGNED (4 BYTE)
COMMAND 11
Read unique Identifier associated with (short) TAG
Description:
This command read the Identifier Device information of HART command 00 by inserting the TAG
parameter.
Write Parameters:
Description HART Data Type Data size
READ UNIQUE IDENTIFIER UNIQ. ID (TAG) BITSTRING (6 BYTES)
ASSOCIATED WHIT TAG
Data Returned:
This command return the same block data of command “0”.
COMMAND 12
Read user Message
Description:
This command reads an ASCII message contained in the HART Device and
written by the Write Message command 17.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
READ USER MESSAGE MESSAGE ASCII BIT STRING (24 BYTES)
COMMAND 13
Read Tag, Descriptor and Date
Description:
This command reads an ASCII Tag which identifies the device, an ASCII
descriptor of the device and the last Date it has been configured.
Data can be write with Command 18.
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10
Write Parameters:
NONE
Floating Point Data Returned:
NONE
Data Returned:
Description HART Data Type Data size
READ TAG TAG ASCII BIT STRING (6 BYTES)
READ DESCRIPTOR DESCRIPTOR ASCII BIT STRING (12 BYTES)
READ DATE CODE DATE ASCII BIT STRING (3 BYTES)
COMMAND 14
Read PV sensor information
Description:
This command reads the PV sensor limit and span. The command is implemented for the HART
protocol conformance but the data are not used for the flow meter application.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
SENSOR SERIAL NUMBER SENSOR S/N UNSIGNED (3 BYTES)
LIMITS UNITS CODE - PV LIMITS UNITS CODES ENUM (1BYTE)
UPPER SENSOR LIMIT - PV UPPER SENSOR LIMIT FLOAT (4 BYTES)
LOWER SENSOR LIMIT - PV LOWER SENS LIMITS FLOAT (4 BYTES)
MIN SPAN - PV MIN SPAN FLOAT (4 BYTES)
COMMAND 15
Read PV output sensor information
Description:
This command reads the PV sensor range and damp val. The command is implemented for the
HART protocol conformance but the data are not used for the flow meter application.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
ALARM SELECT CODE ALRM SEL. CODE ENUM (1BYTE)
TRANSFER FUNCTION CODE TRN. FUNC. CODE CHAR (1BYTE)
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12
FLOW RANGE UNITS CODE RNG UNITS CODE CHAR (1BYTE)
FLOW UPPER-RANGE VAL UP RANG VALUE FLOAT (4 BYTES)
FLOW LOWER-RANGE VAL LO RANG VALUE FLOAT (4 BYTES)
FLOW DAMPING VALUE DAMPING VALUE FLOAT (4 BYTES)
WRITE PROTECT CODE W PROTECT CODE ENUM (1BYTE)
RESERVED (SET TO 250) RESERVED ENUM (1BYTE)
COMMAND 16
Read Final Assembly Number
Description:
This command reads the final assembly number of the HART device.
Data can be write with Command 19.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
ASSEMBLY NUMBER ASSEMB. # UNSIGNED (3 BYTES)
COMMAND 17
Write Message
Description:
This command writes an ASCII message contained in the HART Device and that
can be read with command 12.
Write Parameters:
Description HART Data Type Data size
WRITE USER MESSAGE MESSAGE ASCII BIT STRING (24 BYTES)
Data Returned:
NONE
COMMAND 18
Write Tag, Descriptor and Date
Description:
This command writes an ASCII Tag which identifies the device, an ASCII
descriptor of the device and the last Date it has been configured.
Data can be read with Command 13.
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12
Write Parameters:
Description HART Data Type Data size
READ TAG TAG ASCII BIT STRING (6 BYTES)
READ DESCRIPTOR DESCRIPTOR ASCII BIT STRING (12 BYTES)
READ DATE CODE DATE ASCII BIT STRING (3 BYTES)
Data Returned:
Description HART Data Type Data size
READ TAG TAG ASCII BIT STRING (6 BYTES)
READ DESCRIPTOR DESCRIPTOR ASCII BIT STRING (12 BYTES)
READ DATE CODE DATE ASCII BIT STRING (3 BYTES)
COMMAND 19
Write Final Assembly Number
Description:
This command writes the final assembly number of the HART device.
Data can be read with Command 16.
Write Parameters:
Description HART Data Type Data size
ASSEMBLY NUMBER ASSEMB. # UNSIGNED (3 BYTES)
Data Returned:
Description HART Data Type Data size
ASSEMBLY NUMBER ASSEMB. # UNSIGNED (3 BYTES)
COMMAND 20
Read Long Tag
Description:
This command read the Long Tag.
Data can be read with Command 22.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
READ LONG TAG LONG TAG BITSTRING (32 BYTES)
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COMMAND 21
Read unique ID associated with Long Tag
Description:
This command read the Long Tag.
Data can be read with Command 22.
Write Parameters:
Description HART Data Type Data size
READ UNIQUE IDENTIFIER UNIQ. ID (TAG) BITSTRING (32 BYTES)
ASSOCIATED WHIT LONG
TAG
Data Returned:
This command return the same block data of command “0”.
COMMAND 22
Write Long Tag
Description:
This command write the Long Tag.
Data can be write with Command 20.
Write Parameters:
Description HART Data Type Data size
READ LONG TAG LONG TAG BITSTRING (32 BYTES)
Data Returned:
Description HART Data Type Data size
READ LONG TAG LONG TAG BITSTRING (32 BYTES)
COMMAND 38
Reset configuration change flag
Description:
This command reset the “Configuration change” flag.
Write Parameters:
Description HART Data Type Data size
RESET "CONFIGURATION RESET CONFIG. CHANGE UNSIGN (2BYTE)
CHANGE" flag counter
1415
Data Returned:
Description HART Data Type Data size
RESET "CONFIGURATION RESET CONFIG. CHANGE UNSIGN (2BYTE)
CHANGE" flag counter
COMMAND 48
Read additional device status
Description:
This command read the additional device status bytes. There are 9 additional status bytes but
there is only a bit used that is the bit 0 of the Byte 0. When this bit is set to 1 the converter is in
excitation fail status and the bit “Device malfunction” is on.
Write Parameters:
NONE
Data Returned:
Description HART Data Type Data size
READ ADDITIONAL DEVICE EXTENDED DEVICE STATUS 9 BYTE
STATUS
HART Common Practice commands description
In the following section there is a description of the Common Practice commands
implemented in the module
COMMAND 40
Enter Exit Fixed Current Mode
Description:
The device is placed in the Fixed Primary Variable Current Mode with the Primary Variable Current
set to the value received.
The value are returned in the Response Bytes.
A level of "0" exits the Fixed Primary Variable Current Mode.
Fixed Primary Variable Current Mode is also exited when power is removed from the device.
Write Parameters:
Description HART Data Type Data size
ENTER/EXIT FIXED I MODE SELECT FLOAT (4 BYTES)
CURRENT MODE (IN mA)
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16
Data Returned:
Description HART Data Type Data size
ENTER/EXIT FIXED I MODE SELECT FLOAT (4 BYTES)
CURRENT MODE (IN mA)
HART Device specific commands description
COMMAND 128
Set reset Write protected mode
Description:
This command set or reset the write protected mode.
Write Parameters:
Description HART Data Type Data size
SET-RESET WRITE UNSIGN (1BYTE)
PROTECTED MODE 0=RESET WRITE PROTECTED MODE
1=SET WRITE PROTECTED MODE
Data Returned:
Description HART Data Type Data size
SET-RESET WRITE UNSIGN (1BYTE)
PROTECTED MODE 0=RESET WRITE PROTECTED MODE
1=SET WRITE PROTECTED MODE
1617
3255 WEST STETSON AVENUE • HEMET, CALIFORNIA 92545 USA
TEL: 951-652-6811 • 800-220-2279 • FAX: 951-652-3078 Printed In The U.S.A.
www.mccrometer.com Lit. 30121-84 Rev. 1.0/12-14
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